1. Assuming you are using a cube-map texture for your skybox (i.e. six separate texture images) how did you break-up the skybox image into the separate parts? If you did it manually those lines might just be artifacts in the images themselves.

2. Did you use CLAMP_TO_EDGE as your wrapping policy?

3. Do you see the same artifacts on every edge, or just the three in the picture you posted?

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